Henry h



.substances employed; also, by means of a sliding door,

'by the closing of these slides,

of the precious metals lost, but also that the compounds r @tim ra 'sata HENRY-H. EAMES-or sr. PAUnvMINNEsoTA.

Letters .Patent No. 86,514,

daad Fama/ry 2, 1869.

IMPROVEMENT IN 'DESULPH'URIZING AND TREATING- ORES FOR THE EXTRACTION OE PRECIOUS METALS.

The Schedule referred to in these Lettera Patent and making par't of the same.

To all whom Iit ma/y concern:

Be it known that I, HENRY H. EAMES, ofSt. Paul, in the county of Ramsey, in the State of Minnesota, have inventedanew and improved Munic-Furnace for the Desulphulization of Ores; and I do hereby declare that the following is a full and exact description thereof, reference being had tothe accompanying drawings.

Thenature of my invention consists in bringing the ores to aheated state, in a munie-furnace, without the draught passing over the heated mass, whereby there is a great saving of the precious metals and oxidizing and an opening for the eduction of the vapors during the oxidation of the sulphur and the base metals, and whereby the .Whole of the chlorine is preserved, to act upon the precious metals.

It is well known that not only is a great proportion used for oxidation and chlorination are carried over, when the draught ofthe furnace is allowed to traverse over the ores and the -ingredients used, asin that known as the reverberatory. i

I have found that, whenrthe ore is first introduced into the furnace, a certain amount of ordinary air is necessary for the proper oxidation of the sulphur and the base metals. After this has taken place, the whole should be closed, that the chlorine generated may act upon-the precious metals Without loss either of metals or materials used, as well as the speedy conversion of the precious metals into chlorides.v

I have also found that the hearth, arches, and fireplace of my ,mufilafurnace can be constructed with silex, clay, oxide of iron, common spar, and silicate' of soda, formed and dried in a specified manner, as here-v inafter stated.

To enable others to make and use my invention, I will 'proceed to describev it.

My munie-furnace can be constructed of any size orsbape. As an example, I make the hearth or sole A four (4) feet wide by nine (9) feet long and eighteen (18) inches high, over which` is an arch, B, four-(4) inches in thickness, and corresponding in length and width of hearth.

Over this is another arch, C, four(4) inches thick, and separated by a flue, I), six (6) inches wide, openings E, six (6) inches square, in the back and front of O, for draught into upper flue F, the door lof furnace G, with the slides H, fitting into the mouth of the moitie-furnace, the eduction-pipe I, six (6) inches in diameter, for the vapors during oxidation, with the valve M, for the regulation of the lpassage of air.

The fines or openings h, under the hearth, are six (6) inches by four (4) inches.

The fire-place O is one foot six inches (1 6") high, and twelve (12) inches at bottom, I, and spreading to two (2) feet at top, It, and the length of refplace, O, is four feet six inches (4 6".)

The ash-pit S is twelve (12) inches below re-bars T, and extending to the back of fire-bars.

The outside Walls, U, extend twelve (12) inches on each side beyond theinuter arch C.

In constructing the nre-place, hearth, or sole and arches of my mhe-furnace, I use silex, clay, oxide of iron, common spar, and silicate of soda, in the following proportions:

Ten (l0) pints silex, two (2) pints of clay, one (1) pint oxide of iron, two (2) pints common spar, and one (l) pint silicate of soda.

I do not confine myself to these proportions, but use the silicate of soda, according to the nature and composition of lthe' clay and othenrnaterials in the construction of my inutile-furnace; and, in order that my furnace may become dry in an uniform manner, I inject steamuntil the whole is brought to 2120. I then applya gentle heat, until the whole becomes perfectly dry. It is then fit for use.

What I claim, and desire to secure by Letters Patent, is-

A munie-furnace, for the oxidation of sulphurated ores and chlorination of the precious metals, by the use of slides or valves, whereby the admission or ex-4 clusion of air can be governed, substantially as herein set forth.

Also, the use of silex, clay, oxide of iron., common 

